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XIfEvent()							    XIfEvent()

Name
  XIfEvent – wait for event matched in predicate procedure.

Synopsis
  XIfEvent(display, event_return, predicate, args)
	Display *display;
	XEvent *event_return;
	Bool (*predicate)();
	char *args;

Arguments
  display   Specifies	a  connection  to  an  X  server;  returned  from
	    XOpenDisplay().

  event_return
	    Returns the matched event.

  predicate Specifies the procedure to be called to determine if the next
	    event satisfies your criteria.

  args	    Specifies  the  user-specified  arguments to be passed to the
	    predicate procedure.

Description
  XIfEvent() checks the event queue for events,	 uses  the  user-supplied
  routine  to check if one meets certain criteria, and removes the match‐
  ing event from the input queue.  XIfEvent() returns only when the spec‐
  ified	 predicate  procedure  returns	True for an event.  The specified
  predicate is called once for each event on the queue until a	match  is
  made,	 and each time an event is added to the queue, with the arguments
  display, event_return, and arg.

  If no matching events	 exist	on  the	 queue,	 XIfEvent()  flushes  the
  request  buffer  and	waits  for  an	appropriate event to arrive.  Use
  XCheckIfEvent() if you don't want to wait for an event.

  For more information, see Volume One, Chapter 8, Events.

See Also
  XQLength(), XAllowEvents(), XCheckIfEvent(), XCheckMaskEvent(), XCheck‐
  TypedEvent(),	      XCheckTypedWindowEvent(),	     XCheckWindowEvent(),
  XEventsQueued(),  XGetInputFocus(),  XGetMotionEvents(),  XMaskEvent(),
  XNextEvent(),	  XPeekEvent(),	  XPeekIfEvent(),  XPending(),	XPutBack‐
  Event(),  XSelectInput(),  XSendEvent(),  XSetInputFocus(),	XSynchro‐
  nize(), XWindowEvent().

Xlib - Input Handling						    XIfEvent()

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